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I have a Mars Hydro tent 4'x4'. I am looking for a light used in this grow tent then start grow journl, any suggestion about the light?

You can buy most of products from your local grow shop or from Amazon, Ebay store or buy products from suppliers' official website. For example , I bought Mars Hydro led from their officia website, price is lower than Amazon. You need also read some grow journal or watch some growing video, that...

If you wanna test Mars led, I think you need tell them how you will show your testing firstly

umol/s shows the leds' efficiency, it is more important

You can move the driver of SP250led outsid of tent to lower temperature in the tent

I can not see the actual power of these leds, I think this supplier is using wrong product name to mislead customers, the actual power of this led must be very low

I can not agree with you more brother, I also think Led is the future as leds become more and more affordable and efficient :)

I prefer their MarsproII series led, more red in this series led for bloom and very powerful

It depends on your grow size and budget. Usually more powerful led with higher PAR value will be better , good luck

You can check if your plants get enough nutrition they need, good luck

They are beautiful and healthy and have shown big harvest :)

Nice setup, what's actual power of led you are using? :)

What brand COB you are using? I heard COB need Cree&Osrm chips for better heat dissipation. Is it true? Mars Hydro has promotion for COB: Buy one and get one free

When you use blurple and red led, 35--50W/SF will be needed for bloom, so you need at least 315W actual power led

When you buy led , you need check its draw power(actual power), you should not judge the actual power from the name of that led For example, Mars SP250led, actual power is about 250W but their MarsII1600led, actual power is about 640W

Maybe you need keep the leds closer to the plants to avoid stretch

If you turn on two switches, your plants can get more powerful light. Plants need more powerful light for bloom

These girls are too small to be seen clearly, keep updated , good luck

This essay is too prefessioanl to understand for me Lol ;)

When I grow plants under led, my light cycl is 12/12 for flowering; 18/6 for veg , will it work for all different types light?